HB
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HB is an abbreviation of:
- Hampton and Branchville Railroad Template:Reporting mark
- hard black – a medium grade of pencil lead
- Helvetischer Bund, used as ICAO aircraft registration prefix (since 1935, before: CH) for Switzerland
- Hemoglobin is often abbreviated as Hb
- HB ice cream in Ireland, originally an abbreviation for Hughes Brothers' Dairy, Rathfarnham, now produced by Unilever and part of the Heartbrand.
- Helbreath, a popular PvP MMORPG.
- Brinell hardness
- Huntington Beach, a growing costal town in Southern California